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C304 series product photos for medium-sized, scroll down

The Cetacean Research™ C304 and C304XR Hydrophones have a directional receive pattern with very wide frequency response for monitoring ultrasonic signals not detectable by competing brands. The connector is an integral part of the hydrophone. Hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.

		C304		C304XR
Linear Frequency Range (±3dB) [kHz]		0.012 to 250+		0.012 to 1000
Usable Frequency Range (+3/-12dB) [kHz]		0.005 to 250+		0.005 to 2000+
Transducer Sensitivity* [dB, re 1V/µPa]		-201		-201
Preamplifier Gain [db]		33		20
Effective Sensitivity* [dB, re 1V/µPa]		-168		-181
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa/√Hz]		≈ 63		≈ 63
Power Requirement [Vdc]		5 to 32		5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa]		172 to 189		185 to 202
Maximum Operating Depth ** [m]		460		460
Operating Temperature Range [ºC]		-40 to 60		-40 to 60
Output Impedance []		10		10
Dimensions [mm]		83 L x 32 W x (25 to 6)T		83 L x 32 W x (25 to 6)T
Integral Connector†		Subconn MCBH3MSS		Subconn MCBH3MSS
*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity. **  1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters. † Connectors are rated to a depth of 7,000 meters; see below for mating connector and cables.

Battery / Connector box Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research™ C304 hydrophone is through a watertight female BNC connector with gold center contact. The hydrophones are powered by one or two 9V batteries (not included) or an optional long-life rechargeable, external power supply. Signal Output female BNC Battery Life [hours] > 20 Box Dimensions [mm] 98 long x 64 wide x 40 high